archiver.bbclass: fix the fakeroot and other issues

archiver.bbclass: fix the fakeroot and other issues

* Fix the fakeroot issue
  The archiver.bbclass is used for archiving sources, patches, and logs,
  it uses the "rpmbuild -bs" from the package_rpm.bbclass to generate the
  .src.rpm, but it didn't work (it's not easy to explain it clearly):

  Reason:
  - It directly used the "fakeroot" command, we don't have such a
    command in native tools, so it would use the fakeroot from the host,
    and it would fail when there is no fakeroot on the host.

  - The "rpmbuild -bs" doesn't need to work under root, but it is in the
    function do_package_write_rpm which is running under fakeroot, and
    "rpmbuild" needs to know the source file's user/group name, the source
    file is the tarball which is created by the postfuncs of do_unpack
    or do_patch which doesn't use the fakeroot, so the created file's
    owner would be the real user, e.g.: robert, but there is no such a
    user under our native tools' fakeroot(pseudo), then the rpmbuild would
    fail. It worked when use the host's fakeroot in the past was because
    that the host's fakeroot knows the users on the host.

  Fix:
  - Remove the incorrect "fakeroot".

  - Change the source file's owner to root.root under fakeroot will fix the
    problem.

* Other fixes:
  - The typo: "do_remove_taball -> do_remove_tarball" which will cause the
    tarball is not removed.

  - Add the _sourcedir defination to the rpmbuild command since the the
    SOURCES would be added to the specfile when archiver.bbclass is
    inherited, otherwise there would be errors when "rpmbuild -bb", though
    the build is OK. It only added the defination to "rpmbuild -bs",
    didn't add to "rpmbuild -bb".

[YOCTO #2619]

(From OE-Core rev: ac152f277fdff256def01af4268215a05685a0f7)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>